Most program bugs do not affect the data in files, and when fixed things carry on as normal. A bug which corrupts the data in a file is more serious since if the backup is affected the data will have to be re-entered. This type of error is hopefully banished! Because data is held in two files, 2LAT and 2LATUSR for example, there is sometimes a possibility that a student ends up missing from the USR file and the message "name not found in USR file" could be printed. If this happens, there is a utilility which will add an extra name to this file and then all should be well.
